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A method for integrated biological treatment of nitrous acid sludge and thawing liquid
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A biological treatment, nitrous acid technology, applied in biological water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of unfavorable coupling chemical phosphorus removal process, high chemical cost, increased acid consumption, etc. problems, to achieve the effect of simplifying the operation process, optimizing the process, and increasing the tolerance
Active Publication Date: 2020-05-15
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI +1
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Anaerobic denitrification process is another traditional denitrification process. The pH of the process needs to be controlled at 6-7, which increases acid consumption and high cost of chemicals. On the other hand, the widely used chemical phosphorus removal process generally requires weak alkaline It is carried out under certain conditions, so the effluent of this process is not conducive to the subsequent coupled chemical phosphorus removal process
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example 1
[0024] Example 1 The aerobic denitrification denitrification process was started in the sequencing batch bioreactor system using the nitrous acid sludge thawing liquid from the secondary sedimentation tank of the Jimei District Wastewater Treatment Plant in Xiamen City as the influent
[0025] The sequencing batch bioreactor was used as the reactor to start the aerobic denitrification process, and the inoculum sludge was taken from the aerobic denitrification bioreactor that had been in stable operation for one year. The temperature of the sequencing batch bioreactor is maintained at 25°C±4°C, and the reactor adopts artificial water intake, and the ratio of the feed water volume to the total volume is controlled between 40% and 50%. The integrated biological treatment of nitrous acid sludge cell fusion liquid is started according to the following four stages.
[0026] The first stage. The aerobic denitrification sludge was inoculated in the sequence batch integrated bioreacto...
example 2
[0030] Example 2 Reduce the impact of dissolved oxygen on system stability
[0031] According to the experimental procedure of Example 1, after the third-stage late stage reactor has a stable denitrification effect, and the nitrite removal rate is greater than 98%, the dissolved oxygen in the operating stage is changed from 2.5mgL -1 Reduced to 1.0mg L -1 During the period of one week, the removal rate of nitrate and nitrite decreased slightly, but the removal rate remained above 90%, while the removal rate of phosphate dropped significantly, only about 10%. Nitrite accumulation rate decreased slowly from 80% to 65%. The data show that dissolved oxygen plays an important role in the stable nitrogen and phosphorus removal of the system.
example 3
[0032] Example 3 The effect of increasing the carbon-nitrogen ratio on the treatment effect of the system
[0033] According to the experimental procedure of Example 1, in the late stage of the fourth stage, after the stable integrated carbon, nitrogen and phosphorus synchronous removal effect has been achieved in the system, the carbon and nitrogen ratio of the influent can be increased by adding additional carbon sources. The improvement has a significant role in promoting the established integrated carbon, nitrogen and phosphorus simultaneous removal process, especially the removal of phosphate has been significantly improved.
[0034] Inventors: Zhang Zhaoji, Wang Jinsong, Chen Shaohua, Wang Xiaojun, Ye Xin
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Abstract
The invention relates to a treatment method of nitrous acid sludge disintegration liquid. The treatment method is used as a subsequent sewage treatment process for reducing nitrous acid sludge. The treatment method is characterized by comprising the following steps: collecting the nitrous acid sludge disintegration liquid and regulating and controlling the content of pollutants to enable the content of nitrite in initial disintegration liquid to be 100mgN / L to 120mgN / L and the pH (Potential of Hydrogen) to be 7.0 to 7.5. A stable and high effective operation type aerobic denitrification process is established and the nitrous acid sludge disintegration liquid is treated in a sequencing batch manner. At an initial phase, when the removal rate of phosphate reaches 15 percent or above, the removal rate of COD (Chemical Oxygen Demand), nitrate and nitrite reaches 90 percent; then the lasting time of an operation period of a reactor is shortened and the water inlet total nitrogen load is gradually improved to an actual nitrous acid disintegration liquid level. According to the method provided by the invention, efficient removal of high-load nitrogen-containing sewage in a single-active-sludge sewage treatment reactor can be realized. The method has a simple technical mode and is convenient to operate; the method can be combined with a nitrous acid sludge disintegration process to form a sludge reduction and pollutant removal system. Therefore, the method provided by the invention has a very wide application prospect.
Description
technical field [0001] The invention relates to a sewage treatment method, in particular to a method for integrated biological treatment of nitrous acid sludge cell fusion liquid Background technique [0002] In recent years, the low treatment efficiency of excess sludge in urban sewage treatment plants has restricted the normal operation of sewage treatment plants. Due to the high cost of excess sludge treatment, difficulty in disposal, and easy to cause secondary pollution, how to effectively improve sludge disposal methods and technologies has become an important research content in the sewage treatment industry. As we all know, the sludge treatment process costs of sewage treatment plants account for about 30-60% of the total operating costs. In view of this, various sludge reduction technologies have been proposed one after another. Among them, the nitrous acid sludge fusion (FNA) process can achieve efficient and stable sludge reduction effect, but the sludge fusion s...
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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
CPCC02F3/301C02F3/308
Inventor 张召基王劲松陈少华王晓君叶欣
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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